Sulfur covalently bonded to porous graphitic carbon as an anode material for lithium-ion capacitors with high energy storage performance

Abstract

Sulfur covalently bonded to porous graphitic carbon (CB–S@PGC) as an anode for lithium-ion capacitors is shown to offer an ultrawide operating potential window of 4 V. When coupled with activated carbon as a cathode, the CB–S@PGC electrode exhibits a markedly high specific capacitance (412 F g⁻¹ at 0.2 A g⁻¹) and superiorly high capacity retention. And CB–S@PGC//lithium cobalt oxide cells exhibit high power and energy densities (e.g., a power density of 1665 W kg⁻¹ is obtained at an energy density of 411 W h kg⁻¹).